Tips to improve in cpp

I was good in 23-24 , for some reason i felt like i am loosing my skills(less practice might be the reason or incompleted project)
I want to build some projects but sometimes struggling using docs, of any experienced developers can guide me how to overcome this, reading docs and implementations….
i was building a socket client program and using docs i tried to build secure socket client but at the end including all headers some keywords show undefined and there is no resources , I ask to AI , AI implemented its own class .

https://redd.it/1oge9yu
@r_cpp